For the partially and completely injected microfluidic channels, the operating frequency of the antenna is 2. The 3-D radiation pattern was measured in a shielded radio frequency anechoic chamber [ 31 ] at the lower and upper frequency bands and presented in Figure 7 a,b. In addition, the substrate dielectric properties are not correctly modeled in CST at those higher frequencies. The voltage change will be monitored using a lock-in amplifier referenced at the modulation frequency of the incident radiation. For a wider channel width, the liquid metal can assumes a shape which cannot cover the entire width of the microfluidic channel. The prototype exhibits continuous tuning of the resonant frequencies from 1. In [ 16 ], a frequency reconfigurable Yagi-Uda array was presented to serve as base station antennas.
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The length of the injected liquid metal in the director L 01 and L 1dir corresponding to highest peak gain are listed in the Table 1. In this work, we propose coupling a microbolometer to the feed of the developed Quasi-Yagi loop antenna for performing radiation pattern measurements. Non-member purchase Non-member Purchase History. With the addition of three directors, the antenna gain increased up to 9.
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A microfluidically frequency-reconfigurable quasi-Yagi dipole antenna is presented by employing microfluidic technology. The width and thickness of the microbolometer structure will be exactly determined subsequent to a diple characterization of the electrical resistivity of the available material at the time of fabrication.
The pump voltage and pump frequency can be directly changed with the rotary control elements of the board.
You can purchase after checking ‘Yes’. The measured results show good agreement with simulated results and confirm that the proposed antennas are working. The schematic diagram of the designed antenna with a microbolometer is presented in Figure 6 c. Simulated reflection coefficients by varying the driven element length at: Journal List Sensors Basel v. In recent years, the printed Yagi-Uda antennas have attracted much interest with many applications in radar, millimeter-wave MMW imaging, wireless communication systems, phased arrays, and so forth.
This square pad allows connecting to one microbolometer foldedd. We will notify you whenever a new publication on the topic of the paper you are reading is updated. International Journal of Antennas and Propagation. To improve the impedance matching between the driven antenna and the CPW feedline, a matching section has been utilized. Finally, the remaining photoresist was then removed using acetone.
The Keywords of the article are provided. In Figure 3 a, the simulated gain is plotted for various values of spacing S between the driven element and directors, for all operating frequencies.
Therefore, only three directors are selected. Design of reconfigurable slot antennas. In Figure 2 b,c, the parametric study is performed for the length L 0 of the liquid metal in the microfluidic channel associated with the driven element diploe obtain the operating frequency of the other bands.
Microfluidically Frequency-Reconfigurable Quasi-Yagi Dipole Antenna
The length of driven element and directors can be controlled by the injection of liquid metal in microfluidic channels. Confirm the Institutional membership. All simulations were carried out using Computer Simulation Technology Microwave Studio CST-MWS [ 8 ], which is considered a commercial and industry-standard full wave software program based on numerical analysis of electromagnetic problems.
Nonlinear distortions are also caused by the semiconductor devices. From This Paper Figures, tables, and topics from this paper. References Publications referenced by this paper.
International Journal of Antennas and Propagation
The top view and side view of the proposed antenna are shown in Figures 1 a and 1 brespectively. In this edsign, the driven element is a printed dipole with two rectangular shaped directors in front of it.
Return loss Microstrip Feed line Greater Than. Start Select author name Select article Request Select the preferred profile name Please select the preferred name for your unique author profile. When we measure the radiation pattern, we removed the microcontroller while keeping the tubes. Bandwidth enhancement of a planar printed Quasi-Yagi antenna with size reduction.